نتایج جستجو برای: forest ecology

تعداد نتایج: 155266  

2013
B Wang WJ Wei

1Institute of Forest Ecology and Environmental Protection, Chinese Academy of Forestry, Beijing 100091, PR China 2Liaoning Academy of Forestry, Shenyang 110032, PR China 3School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, PR China 4School of Forestry, Beijing Forestry University, Beijing 100083, PR China 5Ontario Forest Research Institute, Ontario Ministry of Nat...

Journal: :محیط زیست طبیعی 0
منصوره کارگر دانشکده منابع طبیعی دانشگاه علوم کشاورزی و منابع طبیعی ساری زینب جعفریان دانشیار دانشگاه علوم کشاورزی و منابع طبیعی ساری

natural fire inflicting irreparable damage to rangelands and forest areas is cause changes in landscape ecology. the purpose of this research is comparison of artificial neural network (ann) and line regression (lr) models to predict of forest and rangelands fires to this end, the data consist fire burned area and fire were used weather data over a period of 7 years (2006-2012(.the result indic...

2012
Joan Roughgarden Daniel Botkin

Background: What are now increasingly called individual based models (IBMs) have been used in ecology since the 1970s when theoretical ecology began in earnest. The best known examples from that time include the forest computer simulation model (named JABOWA) of Daniel Botkin (Botkin et al 1972) and the computer simulation model of Donald DeAngelis (DeAngelis et al 1991) for a freshwater fish c...

2009
Sándor F. Tóth Robert G. Haight Stephanie A. Snyder Sonney George James R. Miller Mark S. Gregory Adam M. Skibbe

College of Forest Resources, University of Washington, Box 352100, Seattle, WA 98195, United States USDA Forest Service, Northern Research Station, 1992 Folwell Ave., St. Paul, MN 55108, United States c School of Forest Resources, Penn State University, 203 Forest Resources Bldg., University Park, PA 16802, United States Department of Natural Resources and Environmental Sciences, University of ...

1998
Francis E. Putz

Claim of sustainability are virtually impossible to prove but enough is known about tropical forest ecology and silviculture to protect ecosystem functions and maintain biodiversity while still deriving financial profirs from logging . Rapid improvements in long-term forest production will derive from better planning of harvesting operations and stand improvement treatments. Lack of good manage...

2012
Carsten F. Dormann Stanislaus J. Schymanski Juliano Cabral Isabelle Chuine Catherine Graham Florian Hartig Michael Kearney Xavier Morin Christine Römermann Boris Schröder Alexander Singer

The most commonly used approaches to describe distributions of species and biodiversity are known as correlative (syn. phenomenological) species distribution models (Elith & Leathwick, 2009). These methods aim to describe the patterns, not the mechanisms, in the association between species occurrences and environmental data (mainly climatic data). Helmholtz Centre for Environmental Research – U...

2007
Hans Rudolf Heinimann

Nacrtak The forest operations engineering and management community has been facing the problem of improving its scientific visibility, realigning its research efforts to the future challenges, and of strengthening its self-confidence. The paper aims at exploring the paradigms that shaped the development of forest operations as a scientific discipline, sketching a vision how forest operations co...

ریاحی بختیاری, علیرضا , سلمان ماهینی, عبدالرسول , غلامعلی فرد, مهدی, میرزایی, محسن ,

Land cover has rapidly changed due to the relatively high population density, high rate of seasonal and permanent migrants, favorable conditions of natural and cultural, frequency of industrial units, coastal border and harbour and great rate of construction in the mazandaran province in recent years. Land cover changes are led to fragmentation, perforation, dissection, shirinkage, attrition an...

2010
Timothy J Fahey Peter B Woodbury John J Battles Christine L Goodale Steven P Hamburg Scott V Ollinger Christopher W Woodall

© The Ecological Society of America www.frontiersinecology.org E of the principal greenhouse gas (GHG), carbon dioxide (CO2), are driven primarily by the burning of fossil fuels, but the Earth’s biosphere also plays a major role in the global carbon (C) budget. Forest biomes are an important component of the global C budget, because of the large quantities stored in live biomass, detritus, and ...

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